Give balanced reactions for the following: [4 MARKS]
(a) Sodium is dropped in water.
(b) Magnesium reacts with boiling water.
(c) Red hot iron reacts with steam.
(d) Iron reacts with dilute HCI.

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Solution

Each Part: 1 Mark

a) $2 N a (s) s o d i u m + 2 H_{2} O (l) w a t e r \to 2 N a O H (a q) s o d i u m h y d r o x i d e + H_{2} (g) h y d r o g e n$

b) $M g (s) m a g n e s i u m + 2 H_{2} O (l) h o t w a t e r \to M g (O H)_{2} (a q) m a g n e s i u m h y d r o x i d e + H_{2} (g) h y d r o g e n$

c) $3 F e r e d h o t i r o n + 4 H_{2} O s t e a m \to F e_{3} O_{4} i r o n (I I I) o x i d e + 4 H_{2} (g) h y d r o g e n ↑$

d) $F e (s) i r o n + 2 H C l (a q) h y d r o c h l o r i c a c i d \to F e C l_{2} (a q) i r o n (I I) c h l o r i d e + H_{2} (g) h y d r o g e n$

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